Capacitive Behavior and Charge Storage Mechanism of Manganese Dioxide in Aqueous Solution Containing Bivalent Cations

被引:87
作者
Xu, Chengjun [1 ,2 ]
Du, Hongda [1 ]
Li, Baohua [1 ]
Kang, Feiyu [2 ]
Zeng, Yuqun [3 ]
机构
[1] Tsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
[2] Tsinghua Univ, Adv Mat Lab, Dept Mat Sci & Engn, Beijing 100084, Peoples R China
[3] Amperex Technol Ltd, Dongguan 523080, Guangdong, Peoples R China
关键词
electrochemical electrodes; electrolytes; electrolytic capacitors; manganese compounds; X-ray photoelectron spectra; ELECTROCHEMICAL PROPERTIES; SUPERCAPACITOR ELECTRODE; LITHIUM INSERTION; MNO2; FILMS;
D O I
10.1149/1.3021013
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Manganese dioxide shows an ideal capacitive behavior in the aqueous solution containing bivalent cations (Ca2+). A specific capacitance value as high as 310 F g(-1) in 0.1 mol L-1 Ca(NO3)(2) electrolyte was measured at a sweep rate of 2 mV s(-1). A cycle life test was also performed and no capacity loss of MnO2 electrode was found after 600 cycles, which indicates the MnO2 electrode possesses a good cycling property in the aqueous electrolyte containing bivalent cations (Ca2+). X-ray photoelectron spectroscopy data reveal that the Ca2+ ions in the electrolyte are involved in the charge storage process of manganese dioxide in an aqueous system and correspondingly a part of Mn4+ ions will become to Mn3+ ion to balance the charge.
引用
收藏
页码:A73 / A78
页数:6
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